Nev. Rev. Stat. § 243.110
The County of Eureka is hereby created, with the following boundaries: All that portion of the State of Nevada bounded and described as follows: Beginning at a point on the north boundary line of Lander County, equidistant between the northeast and northwest corners of Lander County; thence running southerly along the line established in NRS 243.137 to the south boundary line of Lander County; thence running east along the south boundary line of Lander County to the southeast corner of Lander County; thence running north along the east boundary line of Lander County to the northwest corner of White Pine County; thence running west along the south boundary line of Elko County to the southwest corner of Elko County; thence running along the west boundary line of Elko County to the northeast corner of Lander County; thence running west along the north boundary line of Lander County to the place of beginning.
NRS 243.110